Considerable efforts have been invested in the automotive industry on electrified powertrains in order to reduce passenger cars’ dependence on fossil fuels. Powertrains electrification resulted in a wide range of mass-production hybrid vehicle models, ranging from micro-hybrid, to mild, full, and battery-extended hybrids such as plug-in and range-extender electric vehicles. Fuel savings of these powertrains strongly rely on the energy management strategy deployed on-board, as well as on the technology used to recover the waste heat energy. This paper investigates the fuel savings potential of a mild hybrid vehicle using an organic Rankine cycle for generating electricity from the engine-coolant circuit. The net mechanical power and electrical power generated from the organic Rankine cycle are determined based on experimental data recorded on a 1.2-L turbocharged engine. The coolant temperature is regulated at 85°C and 105°C depending on the engine load. The R-1234yf organic fluid is used and the Rankine operating pressure has been controlled to maximize the overall system efficiency under technological constraints. The dynamic programming control is used as a global optimal energy management strategy in order to define the best strategy for the engine operation and power-split between the electric and thermal paths of the powertrain. A sensitivity analysis is also performed to find the optimal size of the electric motor while taking into account the additional weight of the organic Rankine cycle system. Results show 2.4% of fuel economy improvement on The Worldwide Harmonized Light Vehicles Test Cycles.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Waste heat recovery from engine coolant on mild hybrid vehicle using organic Rankine cycle


    Contributors:


    Publication date :

    2019-09-01


    Size :

    16 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    A Mild Hybrid SIDI Turbo Passenger Car Engine with Organic Rankine Cycle Waste Heat Recovery

    Ekström, Fredrik B. / Rolandson, Ola / Eriksson, Soren et al. | British Library Conference Proceedings | 2019


    A Mild Hybrid SIDI Turbo Passenger Car Engine with Organic Rankine Cycle Waste Heat Recovery

    Eriksson, Andreas / Odenmarck, Christer / Ekström, Fredrik B. et al. | SAE | 2019


    Waste heat recovery: low temperature heat recovery using the Organic-Rankine-Cycle

    Koerner,J.E. / Kobs,T. / Bargende,M. et al. | Automotive engineering | 2013


    Waste Heat Recovery Potential from Internal Combustion Engines Using Organic Rankine Cycle

    Chandra, Krishn / Agarwal, Avinash Kumar / Manca, Oronzio et al. | Springer Verlag | 2021


    Exhaust Recovery of Vehicle Gasoline Engine Based on Organic Rankine Cycle

    ZENG, Ke / HE, Maogang / BAI, Sujuan et al. | SAE | 2011